Out-of-plane orientated self-trapped excitons enabled polarized light guiding in 2D perovskites
arxiv(2024)
摘要
Active optical waveguides combine light source and waveguides together in an
individual component, which are essential for the integrated photonic chips.
Although 1D luminescent materials based optical waveguides were extensively
investigated, 2D waveguides allow photons to flow within a plane and serve as
an ideal component for the ultracompact photonic circuits. Nevertheless, light
guiding in 2D planar structures normally relies on the precise control of
molecular orientation, which is complicated and low yield. Here, we report a
strategy to guide polarized light in 2D microflakes by making use of the
out-of-plane (OP) orientation of self-trapped excitons in as-synthesized 2D
perovskite microplates. A space confined crystallization method is developed to
synthesize 2D perovskite microflakes with dominated broad self-trapped excitons
emission at room temperature, which are highly OP orientated with a percentage
of the OP component over 85
coefficient and improved coupling efficiency of OP orientated self-trapped
exciton emission to the planar waveguide mode of the as-synthesized perovskite
microflakes, we have achieved a broadband polarized light guiding with a full
width at half maximum over 120 nm. Our findings provide a promising platform
for the development of ultracompact photonic circuits.
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